What does Continuous Flow oxygen supply refer to?

Continuous Flow oxygen supply refers to a system where oxygen is delivered at a steady rate, irrespective of the user's immediate need for oxygen. This is particularly important in aviation environments where maintaining a consistent supply of oxygen can be critical for safety and performance. The continuous flow ensures that the aircrew always has an adequate supply available without having to actively demand or trigger the delivery, which can be essential during high-altitude operations where hypoxia (oxygen deficiency) may become a risk.

In contrast, options describing oxygen delivered only when demanded or in preset bursts imply a more reactive system rather than a proactive one. Intermittent supply based on altitude would not provide the essential continuous support needed in critical situations where immediate access to oxygen is necessary for maintaining cognitive and physical performance. Thus, option B is the correct definition of Continuous Flow oxygen supply.